In the main menu, a phone ringing and noises in the background as if there are employees working in the office outside Stanley's room can be heard.

The Meeting Room has many different slides on the projector, some of them being:

Tips for Not Getting Fired: Talk less. Do unbelievably amazing work all the time every day with no expectation of promotion or recognition. Don't get fired.

Using slides to assure employees that everything is okay. Make sure your slide has a slick blue graphic in the header, and throw some bevel on all the text. This will assure a calm and productive work environment.

The whiteboard inside the room also has many notes on it. The entirety of the board is:

The Future Happiness Foundation calls to confirm your order of 1327 boxes. If accepted, the office will be full of cardboard boxes the next time the game resets.

A recorded message is left for you or someone else in the office to warn you of the dangers of recorded messages.

There is a chance you will catch a glimpse of one of your co-workers (actually Stanley himself) behind room 425.

The Boss' Office Keypad, If you enter 1947 on the keypad, the Narrator will say that you entered the right password, but nothing will happen if you input it right away. Entering 1947 again opens the passageway.

Wait for the Narrator to end narration, then type in the keypad: 8888. It will fail, then type 8888 again. This will unlock the passageway, the 8888888888888888 achievement and a voice will say Eight. The voice originates from The Stanley Parable Demo's Eight Game.

At some circumstances, the Narrator will automatically opens the passageway without waiting for you to input the code. Additionally, he will also opens the passageway if you're standing idle in the Boss' Office.

If you follow the path that leads to mentioned ending, follow the zigzag of the Adventure Line and eventually the Narrator will play some music. Keep following the path until you enter a room with a swinging ceiling lamp and boxes. Go further until you find a door labeled '02B'. In the corner you will see Dallas's Mask from the Payday series.

If you follow The Stanley Parable Adventure Line after the music starts, when you reach the company files there will be a path that will lead to the employee 432 Peer Reviews. There are a lot of strange things about employee 432, you can find some here

If you go down the staircase where you have to go to the boss's office, you can find a note from the game Gone Home under the bottom of the stairway.

Sometimes after starting the game, the office area you enter right after leaving Stanley's office will have changed from its old layout to either a square blue area or a hallway. When the layout has changed into the hallway, go to the pile of boxes and papers that are directly outside office 426. One of the papers on the ground will have code on it. When deciphered, the code reads "codes that are secret are the best".

At some times when Stanley first leaves his office, the Narrator will comment "someone is chasing Stanley, he could feel it".

Go to the Textures Tab, and search the keywords, it will say "Stop looking through the game files, you nerd!"

As explained here, the command « bind "t" "ent_teleport player" », allows you to teleport yourself to the nearest obstacle in front of you. If used in the Freedom Ending, you'll be able to get in the open air without triggering the final cutscene, thus being truly free to visit the area.

A skull in the Freedom Ending.

Doing so, you'll soon notice there is a skull by the little barn on the left hand side.